Study on PEFC membrane based on crosslinked FEP using EB-grafting

Akio Matsuura; Tomoyuki Kakigi; Yukiko Sato; Kazuki Fujii; Naohiro Mitani; Jingye Li; Akihiro Oshima; Masakazu Washio

doi:10.1002/masy.200750336

Study on PEFC membrane based on crosslinked FEP using EB-grafting

Akio Matsuura^*, Tomoyuki Kakigi, Yukiko Sato, Kazuki Fujii, Naohiro Mitani, Jingye Li, Akihiro Oshima, Masakazu Washio

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

Polymer electrolyte fuel cell (PEFC) membranes based on crosslinked tetrafluoroethylene-co-hexafluoropropylene (FEP) have been fabricated by pre-irradiation grafting method. The chemical structures of crosslinked materials have been analyzed by Differential Scanning Calorimeter (DSC) and ¹⁹F solid-state Nuclear Magnetic Resonance (NMR) spectroscopy. The radical yields of irradiated samples were measued by Electron Spin Resonance (ESR), and the mechanism of grafting reaction has been discussed. The styrene grafted materials were sulfonated by chlorosulfonic acid. The ion exchange capacity of the obtained sulfonated crosslinked FEP (S-FEP-X) showed 2.0 to 2.4 meq/g, which were 2.2 to 2.7 times higher than that of Nafion®112. Class transition temperatures (T_g) of S-FEP-X were almost independent on crosslinking dose of FEP, and show about 96°C, which are slightly higher than that of Nafion®. The electrochemical properties of the membranes have been measured, and cell performances of them have been evaluated. Ionic conductivities (ICs) of S-FEP-X are 1.2 to 1.6 times higher than that of Nafion®. The higher network densities gave the higher open circuit voltage (OCV). The power density of S-FEP-6ookGy was about 10% higher than that of Nafion® at 500mA/cm². Thus, the obtained sulfonated membranes can be expected to apply for high efficiency PEFC.

Original language	English
Pages (from-to)	221-227
Number of pages	7
Journal	Macromolecular Symposia
Volume	249-250
DOIs	https://doi.org/10.1002/masy.200750336
Publication status	Published - 2007

Keywords

Crosslinking
Electron beam irradiation
Polymer electrolyte fuel cell
Proton exchange membrane
Radiation grafting

ASJC Scopus subject areas

Condensed Matter Physics
Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1002/masy.200750336

Cite this

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title = "Study on PEFC membrane based on crosslinked FEP using EB-grafting",

abstract = "Polymer electrolyte fuel cell (PEFC) membranes based on crosslinked tetrafluoroethylene-co-hexafluoropropylene (FEP) have been fabricated by pre-irradiation grafting method. The chemical structures of crosslinked materials have been analyzed by Differential Scanning Calorimeter (DSC) and 19F solid-state Nuclear Magnetic Resonance (NMR) spectroscopy. The radical yields of irradiated samples were measued by Electron Spin Resonance (ESR), and the mechanism of grafting reaction has been discussed. The styrene grafted materials were sulfonated by chlorosulfonic acid. The ion exchange capacity of the obtained sulfonated crosslinked FEP (S-FEP-X) showed 2.0 to 2.4 meq/g, which were 2.2 to 2.7 times higher than that of Nafion{\textregistered}112. Class transition temperatures (Tg) of S-FEP-X were almost independent on crosslinking dose of FEP, and show about 96°C, which are slightly higher than that of Nafion{\textregistered}. The electrochemical properties of the membranes have been measured, and cell performances of them have been evaluated. Ionic conductivities (ICs) of S-FEP-X are 1.2 to 1.6 times higher than that of Nafion{\textregistered}. The higher network densities gave the higher open circuit voltage (OCV). The power density of S-FEP-6ookGy was about 10% higher than that of Nafion{\textregistered} at 500mA/cm2. Thus, the obtained sulfonated membranes can be expected to apply for high efficiency PEFC.",

keywords = "Crosslinking, Electron beam irradiation, Polymer electrolyte fuel cell, Proton exchange membrane, Radiation grafting",

author = "Akio Matsuura and Tomoyuki Kakigi and Yukiko Sato and Kazuki Fujii and Naohiro Mitani and Jingye Li and Akihiro Oshima and Masakazu Washio",

year = "2007",

doi = "10.1002/masy.200750336",

language = "English",

volume = "249-250",

pages = "221--227",

journal = "Macromolecular Symposia",

issn = "1022-1360",

publisher = "Wiley-VCH Verlag",

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TY - JOUR

T1 - Study on PEFC membrane based on crosslinked FEP using EB-grafting

AU - Matsuura, Akio

AU - Kakigi, Tomoyuki

AU - Sato, Yukiko

AU - Fujii, Kazuki

AU - Mitani, Naohiro

AU - Li, Jingye

AU - Oshima, Akihiro

AU - Washio, Masakazu

PY - 2007

Y1 - 2007

N2 - Polymer electrolyte fuel cell (PEFC) membranes based on crosslinked tetrafluoroethylene-co-hexafluoropropylene (FEP) have been fabricated by pre-irradiation grafting method. The chemical structures of crosslinked materials have been analyzed by Differential Scanning Calorimeter (DSC) and 19F solid-state Nuclear Magnetic Resonance (NMR) spectroscopy. The radical yields of irradiated samples were measued by Electron Spin Resonance (ESR), and the mechanism of grafting reaction has been discussed. The styrene grafted materials were sulfonated by chlorosulfonic acid. The ion exchange capacity of the obtained sulfonated crosslinked FEP (S-FEP-X) showed 2.0 to 2.4 meq/g, which were 2.2 to 2.7 times higher than that of Nafion®112. Class transition temperatures (Tg) of S-FEP-X were almost independent on crosslinking dose of FEP, and show about 96°C, which are slightly higher than that of Nafion®. The electrochemical properties of the membranes have been measured, and cell performances of them have been evaluated. Ionic conductivities (ICs) of S-FEP-X are 1.2 to 1.6 times higher than that of Nafion®. The higher network densities gave the higher open circuit voltage (OCV). The power density of S-FEP-6ookGy was about 10% higher than that of Nafion® at 500mA/cm2. Thus, the obtained sulfonated membranes can be expected to apply for high efficiency PEFC.

AB - Polymer electrolyte fuel cell (PEFC) membranes based on crosslinked tetrafluoroethylene-co-hexafluoropropylene (FEP) have been fabricated by pre-irradiation grafting method. The chemical structures of crosslinked materials have been analyzed by Differential Scanning Calorimeter (DSC) and 19F solid-state Nuclear Magnetic Resonance (NMR) spectroscopy. The radical yields of irradiated samples were measued by Electron Spin Resonance (ESR), and the mechanism of grafting reaction has been discussed. The styrene grafted materials were sulfonated by chlorosulfonic acid. The ion exchange capacity of the obtained sulfonated crosslinked FEP (S-FEP-X) showed 2.0 to 2.4 meq/g, which were 2.2 to 2.7 times higher than that of Nafion®112. Class transition temperatures (Tg) of S-FEP-X were almost independent on crosslinking dose of FEP, and show about 96°C, which are slightly higher than that of Nafion®. The electrochemical properties of the membranes have been measured, and cell performances of them have been evaluated. Ionic conductivities (ICs) of S-FEP-X are 1.2 to 1.6 times higher than that of Nafion®. The higher network densities gave the higher open circuit voltage (OCV). The power density of S-FEP-6ookGy was about 10% higher than that of Nafion® at 500mA/cm2. Thus, the obtained sulfonated membranes can be expected to apply for high efficiency PEFC.

KW - Crosslinking

KW - Electron beam irradiation

KW - Polymer electrolyte fuel cell

KW - Proton exchange membrane

KW - Radiation grafting

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DO - 10.1002/masy.200750336

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SN - 1022-1360

VL - 249-250

SP - 221

EP - 227

JO - Macromolecular Symposia

JF - Macromolecular Symposia

ER -

Study on PEFC membrane based on crosslinked FEP using EB-grafting

Abstract

Keywords

ASJC Scopus subject areas

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